BUSINESSDESK: Trade Me has spent $11.5 million mopping up the 75% of auto-listing aggregator AutoBase it didn’t already own.

Before Trade Me's buy out, the balance of the Autobase shares were split evenly between cofounders Hamish Lusk and David Paviour.

The deal brings AutoBase under complete Trade Me ownership after nine years of an exclusive business arrangement and seven years since the auction company bought a 25% stake in the aggregator, the Wellington-based company said.

AutoBase aggregates listings from car, truck and boat deals, which are then displayed on Trade Me, the online auction site controlled by Fairfax Media.